He had to be of very strong constitution to put up with such tiring mental labour.

他一定有很强健的身体才能担负起那么繁重的脑力劳动.

辞典例句

The differences between manual labour and mental labour are diminishing.

体力劳动和脑力劳动的差别正在缩小.

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He understood it at last after the hardest mental labour.

他经过最艰苦的思索之后,终于弄明白了.

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